I don't think the gas powered LS-based V8s have fuel pressure regulators. There is a pressure sensor on top of the pump though that could have gone bad. Should pop a code in the ECM though, that a scanner would point at.

Hooked up a code scanner? Probably has a code for crank sensor or something that could tell you more.

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I don't think the gas powered LS-based V8s have fuel pressure regulators. There is a pressure sensor on top of the pump though that could have gone bad. Should pop a code in the ECM though, that a scanner would point at.

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My '03 had one...its was a 4.8L V8...i had the same issue and replaced the FPR and all was good